Dell PowerConnect J-8208 Hardware Guide - Page 26
Routing Engine and Control Redundancy, Switch Fabric Redundancy
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Dell PowerConnect J-Series J-EX8208 Ethernet Switch Hardware Guide The fan tray continues to operate indefinitely and provides sufficient cooling even when a single fan fails provided the room temperature is within the operating range. See "Cooling System and Airflow in a J-EX8208 Switch" on page 38. Routing Engine and Control Redundancy Each SRE module contains switch fabric circuitry, Routing Engine circuitry, and switch control and management circuitry. A redundant J-EX8208 switch has two SRE modules: one functions as the master while the other functions as a backup and is in standby mode. This provides the switch with full redundancy (1+1) for Routing Engine and switch control functionality. Table 6 on page 10 shows the available slots in the J-EX8208 chassis and the Routing Engine and control redundancy associated with different SRE module and Switch Fabric (SF) module combinations. Table 6: Routing Engine and Control Redundancy for J-EX8208 Switches Switch Configuration Slot SRE0 Slot SRE1 Slot SF Routing Engine and Control Redundancy User-defined SRE module SRE module Empty Yes configuration Redundant SRE module SRE module SF module Yes configuration Switch Fabric Redundancy The switch fabric circuitry in a J-EX8208 switch is distributed across three modules-two SRE modules and one SF module. Any two of these three modules must be installed and functional to provide a working switch fabric with no redundancy. The third module, when present, provides partial redundancy (2+1) for the switching functionality, such that if any one of the two functional modules becomes nonoperational, the third module takes over. Table 7 on page 10 shows the available slots in a J-EX8208 chassis and the switch fabric redundancy associated with different SRE module and SF module combinations. Table 7: Switch Fabric Redundancy for J-EX8208 Switches Switch Configuration Slot SRE0 Slot SRE1 Slot SF Switch Fabric Redundancy User-defined SRE module SRE module Empty No configuration Redundant SRE module SRE module SF module Yes configuration Related • Switch Fabric and Routing Engine (SRE) Module in a J-EX8208 Switch on page 22 Documentation • Switch Fabric (SF) Module in a J-EX8208 Switch on page 25 10